[nggb] Remove broken JAR detection code.
[nggb] Remove broken JAR detection code.

The build currently depends on ../3rdpartypublic/classext anyway, so
these checks are also pointless.

git-svn-id: 03a8048b5ee8463be5048a3801110fb50f378627@13139 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd

kmdouglass/Micro-Manager,kmdouglass/Micro-Manager